Eric Calais, Purdue University (IMAGE)

Purdue University

Eric Calais, Purdue University

Caption

Eric Calais, a Purdue professor of geophysics, shows GPS equipment used to track movements of the Earth's surface as small as one millimeter. These tiny movements show the build up of stress that could lead to an earthquake and are used in evaluating the potential threat to an area.

Credit

Purdue News Service file photo/David Umberger

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